CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,156,877	$ 3,180,212
Construction in progress	117,503	113,609
Land held for development	5,881	5,881
Total investments in real estate	3,280,261	3,299,702
Accumulated depreciation	(1,144,291)	(1,111,007)
Net investments in real estate	2,135,970	2,188,695
INVESTMENTS IN PARTNERSHIPS, at equity:	106,945	216,823
OTHER ASSETS:
Cash and cash equivalents	42,198	15,348
Tenant and other receivables (net of allowance for doubtful accounts of $7,491 and $7,248 at June 30, 2018 and December 31, 2017, respectively)	30,708	38,166
Intangible assets (net of accumulated amortization of $14,294 and $13,117 at June 30, 2018 and December 31, 2017, respectively)	17,857	17,693
Deferred costs and other assets, net	122,221	112,046
Assets Held-for-sale, Not Part of Disposal Group, Current	15,874
Total assets	2,471,773	2,588,771
LIABILITIES:
Mortgage loans payable, net	1,056,686	1,056,084
Long-term Debt	546,919	547,758
Revolving Facilities		53,000
Tenants’ deposits and deferred rent	13,742	11,446
Distributions in excess of partnership investments	94,639	97,868
Derivative Liability		20
Accrued expenses and other liabilities	69,445	61,604
Total liabilities	1,781,431	1,827,780
COMMITMENTS AND CONTINGENCIES (Note 6):
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; 70,450 and 69,983 issued and outstanding shares at June 30, 2018 and December 31, 2017, respectively	70,450	69,983
Capital contributed in excess of par	1,667,302	1,663,966
Accumulated other comprehensive income		(7,226)
Distributions in excess of net income	(1,192,770)	(1,117,290)
Total equity—Pennsylvania Real Estate Investment Trust	559,778	624,039
Noncontrolling interest	130,564	136,952
Total equity	690,342	760,991
Total liabilities and equity	2,471,773	2,588,771
Series B Preferred Stock [Member]
EQUITY:
Preferred Shares	35	35
Total equity	35	35
Series C Preferred Stock [Member]
EQUITY:
Preferred Shares	69	69
Total equity	69	69
Series D Preferred Stock [Member]
EQUITY:
Preferred Shares	50	50
Total equity	50	50
AOCI Attributable to Parent [Member]
EQUITY:
Total equity	$ 14,642	$ 7,226